db_migration: Migrated TaskStateInDb.items field pickle to json#296
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based on #294
This PR introduces a schema migration for the TaskStateInDb table, replacing the legacy pickle-based storage with a structured JSON representation.
Historically, task state items were stored as binary (pickle) blobs in the database. This approach has proven to be brittle and difficult to maintain. In particular, changes and upgrades in beets break deserialization, requiring manual intervention to recover or migrate data.